WO2015019450A1 - 電流電圧変換回路、光受信器及び光終端装置 - Google Patents

電流電圧変換回路、光受信器及び光終端装置 Download PDF

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Publication number
WO2015019450A1
WO2015019450A1 PCT/JP2013/071394 JP2013071394W WO2015019450A1 WO 2015019450 A1 WO2015019450 A1 WO 2015019450A1 JP 2013071394 W JP2013071394 W JP 2013071394W WO 2015019450 A1 WO2015019450 A1 WO 2015019450A1
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WIPO (PCT)
Prior art keywords
voltage
signal
control circuit
gain control
convergence
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PCT/JP2013/071394
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English (en)
French (fr)
Japanese (ja)
Inventor
雅樹 野田
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2013/071394 priority Critical patent/WO2015019450A1/ja
Priority to KR1020167003167A priority patent/KR101854054B1/ko
Priority to CN201380078608.XA priority patent/CN105432030B/zh
Priority to US14/909,412 priority patent/US9712254B2/en
Priority to JP2015530608A priority patent/JP6058140B2/ja
Publication of WO2015019450A1 publication Critical patent/WO2015019450A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/693—Arrangements for optimizing the preamplifier in the receiver
    • H04B10/6931—Automatic gain control of the preamplifier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M11/00—Power conversion systems not covered by the preceding groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks

Definitions

  • the present invention relates to a current-voltage conversion circuit that converts a burst current signal into a voltage signal, an optical receiver that receives a burst optical signal, and an optical termination device.
  • a point-to-point called a PON (Passive Optical Network) system realized by a public network using optical fibers.
  • PON Passive Optical Network
  • a multipoint (Point-to-Multi-point) access optical communication system is widely used.
  • the PON system is an ONU that is a plurality of subscriber-side terminal devices that are connected to one OLT (Optical Line Terminal) that is a station side apparatus and an optical star coupler (Star Coupler). (Optical Network Unit: optical network device).
  • OLT Optical Line Terminal
  • Star Coupler optical star coupler
  • optical network Unit optical network device
  • the optical wavelength band from 1480 to 1500 nm is used in the downstream direction from the OLT to the ONU.
  • the broadcast communication method used is used.
  • Each ONU extracts only the data of the assigned time slot from the optical signal transmitted from the OLT.
  • the upstream direction from each ONU to the OLT uses an optical wavelength band of 1290 to 1330 nm, and uses a time division multiplex communication system that controls transmission timing so that data transmitted by each ONU does not collide. Since the transmission timing is not constant and there is a no-signal period between data transmitted by each ONU, the signal received by the OLT is a burst optical signal.
  • the downstream direction from the OLT to the ONU uses the optical wavelength band 1575 to 1580 nm.
  • An information communication system is used.
  • Each ONU extracts only the data of the assigned time slot from the optical signal transmitted from the OLT.
  • the upstream direction from each ONU to the OLT uses an optical wavelength 1260 to 1280 nm band, and uses a time division multiplex communication system that controls transmission timing so that data transmitted by each ONU does not collide.
  • the OLT optical receiver since each ONU is located at a different distance from the OLT, the light reception level in the OLT of the optical signal transmitted by each ONU differs for each received packet received by the OLT from each ONU. Therefore, the OLT optical receiver is required to have a wide dynamic range characteristic (Wide Dynamic Range) for stably and rapidly reproducing packets having different light reception levels. For this reason, the OLT optical receiver includes an AGC (Automatic Gain Control) circuit that quickly changes the conversion gain of the transimpedance amplifier that converts the photocurrent into a voltage signal to an appropriate gain according to the received light level. Is provided.
  • AGC Automatic Gain Control
  • the OLT optical receiver Since the AGC circuit has a time constant until the conversion gain converges after starting to receive the packet signal, the OLT optical receiver stably reproduces the data after starting to receive the packet signal. A certain amount of time is required until. Here, the time required for the conversion gain to converge is limited according to the transmission rate of the system. In the case of the G-PON system or the XG-PON system, it is necessary to converge the conversion gain in several tens of ns or less, and a high-speed AGC function is required.
  • each packet signal is composed of an overhead area and a data area.
  • the overhead area is a “01” alternating fixed code string and the data area is a random code string.
  • the ideal operation of the AGC function of the optical receiver for OLT is to converge at a high speed in the overhead region and to maintain a fixed gain in the data region.
  • Patent Document 1 Various systems have been proposed for AGC circuits that have high-speed response and are stabilized with an appropriate gain in the data region (for example, Patent Document 1).
  • the automatic gain adjustment circuit described in Patent Document 1 has a function of controlling the conversion gain based on the detection result of the peak level detection circuit, and the response speed of the automatic gain adjustment circuit is only near the head of the received packet signal. I try to be fast.
  • the automatic gain adjustment circuit described in Patent Document 1 includes a time constant circuit including a capacitor or the like in the peak level detection circuit so that the transient response is completed in the overhead region.
  • the automatic gain adjustment circuit has high-speed response in the overhead region and can be operated with a stable gain in the data region after a predetermined time has elapsed.
  • This automatic gain adjustment circuit detects that the pulse train has been interrupted for a certain period of time at the end of the packet signal, so that the charge of the capacitor of the time constant circuit of the peak level detection circuit is discharged by the reset signal, so that an initial response capable of high-speed response Return to the state.
  • each packet signal in the G-PON system and the XG-PON system is a random code string in the data area and includes the same code continuous pattern.
  • the gain band of the automatic gain adjustment circuit is not appropriate for the bit rate, the peak level detection value varies in the data area in the packet signal, so that the automatic gain adjustment circuit is in the middle of the data area.
  • the amplification gain of the signal may change, and it becomes difficult to stably reproduce the received signal.
  • the present invention has been made in view of the above circumstances, and provides a current-voltage conversion circuit or the like that can make a conversion gain respond quickly at the start of packet reception and can be stabilized to an appropriate conversion gain in the data region.
  • the purpose is to provide.
  • a current-voltage conversion circuit of the present invention converts a current signal into a voltage signal, based on a transimpedance amplifier whose conversion gain is variable, and a bottom voltage of the voltage signal output from the transimpedance amplifier.
  • a gain control circuit that controls the conversion gain; and a convergence determination circuit that determines whether the gain control circuit is in a convergence state or a non-convergence state and outputs a determination signal to the gain control circuit.
  • the determination signal indicates that the non-convergence state has changed to the convergence state, the conversion gain is held at the value at the time of transition.
  • the conversion gain responds at a high speed at the start of packet reception, and to stabilize the conversion gain to an appropriate value in the data area.
  • the optical communication system 1 is a PON (Passive Optical Network) system adopting a point-to-multi-point format.
  • the optical communication system 1 includes a single OLT (Optical Line Terminal) 10 as a station side device and an ONU (Optical Network) as a plurality of subscriber side terminal devices.
  • the OLT 10 includes an optical receiver 11, an optical transmitter 12, a wavelength multiplexing coupler 13, and a transmission control unit 14.
  • the wavelength multiplexing coupler 13 is for outputting a downstream signal and an upstream signal having different optical wavelengths in a predetermined direction.
  • the optical signal output from the ONU 20 and transmitted through the optical fiber 32 is output to the optical receiver 11 side, and the optical signal output from the optical transmitter 12 is output to the optical fiber 32 side to which the ONU 20 is connected. .
  • the transmission control unit 14 generates a modulation signal based on a baseband signal input from an external network 40 such as the Internet and inputs the modulation signal to the optical transmitter 12.
  • the optical transmitter 12 modulates light emitted from a light emitting element such as a semiconductor laser with a modulation signal input from the transmission control unit 14.
  • the modulated optical signal is output as a downstream signal via the wavelength multiplexing coupler 13, transmitted through the optical fiber 32, and received by each ONU 20.
  • the upstream optical signal transmitted from the ONU 20 and transmitted through the optical fiber 32 is input to the optical receiver 11 via the wavelength multiplexing coupler 13.
  • the optical receiver 11 photoelectrically converts the input optical signal, demodulates the received optical signal into a received signal, and outputs the received signal to the transmission control unit 14.
  • the transmission control unit 14 converts the input received signal into a baseband signal and outputs it to the external network 40.
  • the optical signal transmitted from each ONU 20 is a burst signal in which a plurality of packet signals are intermittently continued, and an optical signal obtained by time-division multiplexing a plurality of packet signals is input to the OLT 10. Since each ONU 20 is connected to the OLT 10 via an optical fiber 32 of an arbitrary length and an arbitrary number of optical star couplers 30, the intensity of the optical signal received by the optical receiver 11 of the OLT 10 is different for each packet. to differ greatly. That is, in order to stably obtain a received signal from such an optical signal, the optical receiver 11 needs to have a configuration that can handle a wide dynamic range.
  • the optical receiver 11 of the OLT 10 includes a light receiving element 111 that outputs a current signal corresponding to the received optical signal, and a transimpedance amplifier that converts the current signal output from the light receiving element 111 into a voltage signal.
  • Trance-impedance-Amplifier (TIA) 112 and a limiting amplifier (Limiting Amplifier: LIM) 113 that outputs a reception signal obtained by amplifying the voltage signal output from the transimpedance amplifier 112 to substantially the same amplitude.
  • the optical receiver 11 detects the bottom voltage of the voltage signal output from the transimpedance amplifier 112, and controls the gain of the transimpedance amplifier 112 based on the detected bottom voltage, and the gain output from the gain control circuit 114.
  • a convergence determination circuit 115 that determines the convergence state of the control signal is further provided.
  • the transimpedance amplifier 112 includes a fixed resistor 1121 and a variable resistance element 1122, and the current / voltage conversion gain of the transimpedance 112 is determined by these resistance values.
  • the variable resistance element 1122 is configured by, for example, a field-effect transistor (FET) or the like, and is a circuit element whose resistance value can be controlled by an input voltage.
  • FET field-effect transistor
  • the variable gain element 1122 receives a gain control signal generated by the gain control circuit 114 based on the bottom voltage of the voltage signal.
  • the transimpedance amplifier 112 can output a voltage signal that is current-voltage converted with a conversion gain controlled based on the bottom voltage.
  • the gain control circuit 114 has a configuration in which the cathode side terminal of the diode 1142 is connected to the output part of the operational amplifier 1141, and the anode side terminal of the diode 1142 is connected to the inverting input part of the operational amplifier 1141.
  • a capacitor 1143 charged by the anode terminal voltage is also connected to the anode terminal of the diode 1142.
  • a switch 1144 for discharging the charge charged in the capacitor 1143 according to an external reset signal is provided in parallel with the capacitor 1143.
  • the external reset signal is a pulse signal output from an arbitrary circuit that detects the end of the packet signal, and is output from, for example, the transmission control unit 14.
  • the convergence determination circuit 115 compares the output voltage of the operational amplifier 1141 with a preset threshold voltage, and outputs a comparison result at a High / Low voltage, and the output signal of the comparator 1151 and the external
  • the logic circuit 1152 generates a convergence determination signal based on the reset signal.
  • the convergence determination signal output from the logic circuit 1152 of the convergence determination circuit 115 is input to the shutdown terminal of the operational amplifier 1141. Based on the convergence determination signal, the gain control circuit 114 operates to detect the bottom voltage by following the input voltage waveform in the non-convergence state, and stops the tracking operation in the convergence state regardless of the input voltage waveform. When the transition from the non-convergence state to the convergence state is performed, the bottom voltage detection result at the time is operated.
  • the packet signal received by the optical receiver 11 is composed of an overhead area composed of a fixed code sequence of “01” alternating and a data area composed of a random pattern including the same code continuous pattern. ing.
  • the packet signals input from the ONUs 20 to the OLT 10 are transmitted so as not to collide by time division multiplexing, but an external reset signal as shown in FIG. 3B is inserted between the packet signals.
  • an external reset signal as shown in FIG. 3B is inserted between the packet signals.
  • the switch 1144 is turned on, and the charge charged in the capacitor 1143 is discharged.
  • the output voltage (C point voltage) of the gain control circuit 114 is initialized to High, and the resistance value of the resistance variable element 1122 is maximized. That is, the current-voltage conversion gain of the transimpedance amplifier 112 is in the maximum gain state, and is prepared for the next input packet signal.
  • the output part (point A) of the transimpedance amplifier 112, which is an inverting amplifier, at the head of the overhead area receives the voltage signal amplified with the maximum gain, as shown in FIG. Output.
  • the voltage of the output part (point C) of the gain control circuit 114 starts to decrease, and the gain control circuit 114 starts the follow-up operation so as to become the same voltage as the bottom voltage of the voltage waveform at the point A.
  • the resistance value of the variable resistance element 1122 decreases and the conversion gain of the transimpedance amplifier 112 also decreases, so that the amplitude of the voltage waveform at the point A operates to become transiently small.
  • the voltage at the point C becomes equal to the bottom voltage at the point A, no current flows through the diode 1142, and no charge is charged in the capacitor 1143 of the gain control circuit 114, so the voltage at the point C does not drop any further.
  • the voltage at the output section (point B) of the operational amplifier 1141 decreases after receiving the packet signal, as with the point C. .
  • the voltage at point C becomes equal to the bottom voltage value at point A, the voltage at point B begins to rise.
  • the comparator 1151 of the convergence determination circuit 115 outputs High and Low voltages depending on whether or not the input voltage (point B) is higher than the threshold voltage (point D).
  • the threshold voltage (point D) of the comparator 1151 is set to a desired voltage within the fluctuation range of the point B voltage.
  • the voltage at the output part (point E) of the comparator 1151 increases from the high level to the low level when the voltage at the point B decreases. In this case, a transition is made from Low to High.
  • the logic circuit 1152 generates a gate signal (point F) that transitions from High to Low at the rising edge of the external reset signal and from Low to High at the rising edge of the E point voltage as shown in FIG.
  • the gate signal (point F) output from the logic circuit 1152 indicates whether or not the gain control circuit 114 has converged, and is a signal that becomes Low when in the non-convergent state and becomes High when in the converged state. .
  • the output (point F) of the logic circuit 1152 of the convergence determination circuit 115 is connected to the shutdown circuit unit of the operational amplifier 1141 of the gain control circuit 114.
  • the operational amplifier 1141 operates normally when the F point voltage is Low (non-convergence state), and shuts down and outputs a constant voltage when the F point voltage is High (convergence state).
  • the point F voltage is low, the point C voltage is lowered until it becomes the same as the bottom voltage of the voltage signal input to the operational amplifier 1141, and when the operational amplifier 1141 is shut down, the point F voltage is changed from low. The value at the time of transition to High is held.
  • the gain control circuit 114 operates so as to detect the bottom voltage following the input voltage waveform in the non-convergence state, and the bottom at the time of transition from the non-convergence state to the convergence state in the convergence state regardless of the input voltage waveform. It operates to hold the voltage detection result.
  • the gain of the transimpedance amplifier 112 is gradually decreased from a high gain in the non-convergent state, and is kept constant in the converged state.
  • an external reset signal is input from the outside such as the transmission control unit 14, so that the switch 1144 is turned on and the capacitor 1143 is charged. The charge is discharged.
  • the output voltage of the gain control circuit 114 is initialized to High, and the resistance value of the variable resistance element 1122 is maximized.
  • the conversion gain of the transimpedance amplifier 112 is in the maximum gain state, and prepares for the reception of the next packet signal.
  • the operations at points A and C in the overhead region are the same as the operations of the optical receiver 11 of this embodiment (FIG. 3). However, for example, when the gain band of the transimpedance amplifier 112 is insufficient with respect to the bit rate, the operation at the points A and C differs in the data area as shown in FIG. 4C.
  • the output amplitude of the transimpedance amplifier 112 is small because it contains a relatively high frequency component with respect to the “01” alternating.
  • a pattern string having the same sign, such as “00001111” contains a relatively large amount of low frequency components, so that the output amplitude of the transimpedance amplifier 112 becomes large.
  • the transimpedance amplifier includes an overhead area composed of a fixed code sequence having an alternating "01" and a data area composed of a random pattern including the same code continuous pattern.
  • the output amplitude of the output unit 112 (point A) and the minimum bottom voltage of the output waveform are different.
  • the gain control operation by the gain control circuit 114 is once completed in the overhead region and then the data region.
  • the gain of the transimpedance amplifier 112 may fluctuate as shown in FIG. 4D, making it difficult to reproduce the received signal stably.
  • the optical receiver 11 includes the convergence determination circuit 115, so that the gain control circuit 114 operates to detect the bottom voltage following the input voltage waveform when in the non-convergence state, In the convergence state, the bottom voltage detection result at the time of transition from the non-convergence state to the convergence state is maintained regardless of the input voltage waveform. For this reason, even if the gain band of the transimpedance amplifier 112 is insufficient with respect to the bit rate, the transimpedance amplifier after the bottom voltage detection operation converges in the overhead region composed of the “01” alternating fixed code string. The current-voltage conversion gain 112 is fixed to an appropriate value. Therefore, the optical receiver 11 does not fluctuate in the conversion gain even in the data area composed of a random pattern, and enables a stable reception signal reproduction operation.
  • the gain control circuit 114 detects the bottom voltage with respect to the voltage signal output from the transimpedance amplifier 112 that performs current-voltage conversion, and the transimpedance is based on the detection result.
  • the convergence determination circuit 115 determines whether the gain control is in the convergence state or the non-convergence state, and determines that the determination signal has transitioned from the non-convergence state to the convergence state.
  • the gain control circuit 114 maintains the conversion gain at the value at the time of transition. As a result, gain control in the overhead region can be made to respond at high speed, and in the data region, it is possible to increase resistance to the same code continuous data.
  • the present invention converts a current signal into a voltage signal, detects a transimpedance amplifier whose conversion gain is variable, and a bottom voltage of the voltage signal output from the transimpedance amplifier, and based on the detection result, transimpedance A gain control circuit that controls the conversion gain of the amplifier, and a convergence determination circuit that determines whether the gain control circuit is in a convergence state or a non-convergence state.
  • the conversion gain is held at the value at the time of transition.
  • the conversion gain can be made to respond at a high speed at the start of packet reception, and can be stabilized to an appropriate conversion gain in the data area.
  • the gain control is performed and the convergence state is determined based on the bottom voltage detected by the gain control circuit 114.
  • the convergence state is determined based on the detected peak voltage.
  • the convergence state may be determined while controlling the gain.
  • the photocurrent output from the light receiving element 111 is converted into a voltage signal and output.
  • the present invention is not limited to this, and a burst-like current signal having a large dynamic range is input.
  • the present invention can be applied to any current-voltage conversion circuit that outputs a voltage signal based thereon.
  • optical communication system 10 OLT, 20 ONU, 30 optical star coupler, 32 optical fiber, 40 external network, 11 optical receiver, 111 light receiving element, 112 transimpedance amplifier, 1121 fixed resistance, 1122 variable resistance element, 113 limiting Amplifier, 114 gain control circuit, 1141 operational amplifier, 1422 diode, 1143 capacitor, 1144 switch, 115 convergence determination circuit, 1151 comparator, 1152 logic circuit, 12 optical transmitter, 13 wavelength multiplexing coupler, 14 transmission control unit

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Power Engineering (AREA)
  • Optical Communication System (AREA)
  • Control Of Amplification And Gain Control (AREA)
PCT/JP2013/071394 2013-08-07 2013-08-07 電流電圧変換回路、光受信器及び光終端装置 WO2015019450A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2013/071394 WO2015019450A1 (ja) 2013-08-07 2013-08-07 電流電圧変換回路、光受信器及び光終端装置
KR1020167003167A KR101854054B1 (ko) 2013-08-07 2013-08-07 전류 전압 변환 회로, 광 수신기 및 광 종단 장치
CN201380078608.XA CN105432030B (zh) 2013-08-07 2013-08-07 电流电压转换电路、光接收器及光终端装置
US14/909,412 US9712254B2 (en) 2013-08-07 2013-08-07 Current-voltage conversion circuit, optical receiver, and optical terminator
JP2015530608A JP6058140B2 (ja) 2013-08-07 2013-08-07 電流電圧変換回路、光受信器及び光終端装置

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CN105432030A (zh) 2016-03-23
CN105432030B (zh) 2017-12-29
KR20160030249A (ko) 2016-03-16
US20160173205A1 (en) 2016-06-16
JPWO2015019450A1 (ja) 2017-03-02
US9712254B2 (en) 2017-07-18
KR101854054B1 (ko) 2018-05-02

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